Networks [1]}, [2]} abound and increasingly shape our world, ranging from infrastructural networks (transportation, telecommunication, power-grids, water, etc.) over social networks to brain and biological networks. In general, a network consists of a graph or underlying topology and a dynamic process that takes place on the network. Some examples of processes on a network are percolation [3]} and epidemic spreading [4]}, [5]}, that possess a phase transition [6]}, [7]}. While most real-world processes on networks are non-linear, linearisation allows for hierarchical structuring of processes on the network [8]}.
